103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
/*
|
|
* Copyright (c) 2015 Intel Corporation
|
|
* Copyright (c) 2017 Linaro Limited
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
*
|
|
* Network loopback interface implementation.
|
|
*/
|
|
|
|
#define SYS_LOG_DOMAIN "netlo"
|
|
#define SYS_LOG_LEVEL CONFIG_SYS_LOG_NETLO_LEVEL
|
|
#include <logging/sys_log.h>
|
|
|
|
#include <misc/printk.h>
|
|
|
|
#include <net/net_pkt.h>
|
|
#include <net/buf.h>
|
|
#include <net/net_ip.h>
|
|
#include <net/net_if.h>
|
|
|
|
int loopback_dev_init(struct device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void loopback_init(struct net_if *iface)
|
|
{
|
|
/* RFC 7042, s.2.1.1. address to use in documentation */
|
|
net_if_set_link_addr(iface, "\x00\x00\x5e\x00\x53\xff", 6,
|
|
NET_LINK_DUMMY);
|
|
}
|
|
|
|
static int loopback_send(struct net_if *iface, struct net_pkt *pkt)
|
|
{
|
|
struct net_pkt *cloned;
|
|
int res;
|
|
|
|
if (!pkt->frags) {
|
|
SYS_LOG_ERR("No data to send");
|
|
return -ENODATA;
|
|
}
|
|
|
|
/* We need to swap the IP addresses because otherwise
|
|
* the packet will be dropped.
|
|
*/
|
|
|
|
if (net_pkt_family(pkt) == AF_INET6) {
|
|
struct in6_addr addr;
|
|
|
|
net_ipaddr_copy(&addr, &NET_IPV6_HDR(pkt)->src);
|
|
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->src,
|
|
&NET_IPV6_HDR(pkt)->dst);
|
|
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->dst, &addr);
|
|
} else {
|
|
struct in_addr addr;
|
|
|
|
net_ipaddr_copy(&addr, &NET_IPV4_HDR(pkt)->src);
|
|
net_ipaddr_copy(&NET_IPV4_HDR(pkt)->src,
|
|
&NET_IPV4_HDR(pkt)->dst);
|
|
net_ipaddr_copy(&NET_IPV4_HDR(pkt)->dst, &addr);
|
|
}
|
|
|
|
/* We should simulate normal driver meaning that if the packet is
|
|
* properly sent (which is always in this driver), then the packet
|
|
* must be dropped. This is very much needed for TCP packets where
|
|
* the packet is reference counted in various stages of sending.
|
|
*/
|
|
cloned = net_pkt_clone(pkt, MSEC(100));
|
|
if (!cloned) {
|
|
res = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
res = net_recv_data(iface, cloned);
|
|
if (res < 0) {
|
|
SYS_LOG_ERR("Data receive failed.");
|
|
goto out;
|
|
}
|
|
|
|
net_pkt_unref(pkt);
|
|
|
|
out:
|
|
/* Let the receiving thread run now */
|
|
k_yield();
|
|
|
|
return res;
|
|
}
|
|
|
|
static struct net_if_api loopback_if_api = {
|
|
.init = loopback_init,
|
|
.send = loopback_send,
|
|
};
|
|
|
|
NET_DEVICE_INIT(loopback, "lo",
|
|
loopback_dev_init, NULL, NULL,
|
|
CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
|
|
&loopback_if_api, DUMMY_L2,
|
|
NET_L2_GET_CTX_TYPE(DUMMY_L2), 536);
|